java - java中可以比较两个不同的对象吗？

Question

这个问题已经有答案了:

Comparing different type of Objects with comparable (4 个回答)

已关闭 6 年前。

我想比较不同类的对象“名称”属性。有人可以解释一下我该怎么做吗？这是代码。

class Cat implements Comparable<Cat>{
String name;
Cat(){
  super();
}
Cat(String name){
  this.name = name;
}
@Override
 public int compareTo(Cat obj){
  return this.name.compareTo(obj.name);
 }
}
class Dog extends Cat{
 String name;
 Dog(String name){
    this.name = name;
  }
}

public class Compare {
  public static void main(String[] args) {
   Cat oCat1 = new Cat("Meow");
   Cat oCat2 = new Cat("Purr");
   Dog oDog1 = new Dog("Rex");
  int result = oCat1.compareTo(oDog1);
   System.out.println(result);
 }
}

Answer 1

拥有这个 super 类怎么样

class NamedPet implements Comparable<NamedPet> {

    private String name ;

    public NamedPet(String name) {
        this.name = name;
    }

    public int compareTo(NamedPet otherPet){
        return this.name.compareTo(otherPet.name);
    }
}